Hot-carrier cooling in lead-bromide perovskite materials

Thomas R. Hopper; Andrei A. Gorodetsky; Franziska Krieg; Maryna I. Bodnarchuk; Xiaokung Huang; Robert Lovrincic; Maksym V. Kovalenko; Artem A. Bakulin

doi:10.1117/12.2528131

9 September 2019 Hot-carrier cooling in lead-bromide perovskite materials

Thomas R. Hopper, Andrei A. Gorodetsky, Franziska Krieg, Maryna I. Bodnarchuk, Xiaokung Huang, Robert Lovrincic, Maksym V. Kovalenko, Artem A. Bakulin

Author Affiliations +

Proceedings Volume 11084, Physical Chemistry of Semiconductor Materials and Interfaces XVIII; 110840F (2019) https://doi.org/10.1117/12.2528131
Event: SPIE Nanoscience + Engineering, 2019, San Diego, California, United States

Abstract

Lead-halide perovskites are currently the highest-performing solution-processable semiconductors for solar energy conversion, with record efficiencies rapidly approaching that of the Shockley-Queisser limit for single-junction solar cells. Further progress in the development of lead-halide perovskite solar cells must overcome this limit, which largely stems from the ultrafast relaxation of high-energy hot carriers above the bandedge. In this contribution, we use a highly-specialized pump-push-probe technique to unravel the key parameters which control hot carrier cooling in bulk and nanocrystal (NC) lead bromide perovskites with different material composition, NC diameter and surface treatment. All samples exhibit slower cooling for higher hot carrier densities, which we assign to a phonon bottleneck mechanism. By comparing this density-dependent cooling behavior in the different samples, we find that the weak quantum confinement of electronic states and the surface defects in the NCs play no observable role in the hot carrier relaxation. Meanwhile, in accordance with our previous observations for bulk perovskites, we show that the cation plays a critical role towards carrier cooling in the perovskite NCs, as evidenced by the faster overall cooling in the hybrid FAPbBr₃ NCs with respect to the all-inorganic CsPbBr₃ NCs. These observations highlight the crucial role of the cations toward the phononic properties of lead-halide perovskites, and further point towards the defect tolerance of these emerging solution-processed semiconductors.

Citation Download Citation

Thomas R. Hopper, Andrei A. Gorodetsky, Franziska Krieg, Maryna I. Bodnarchuk, Xiaokung Huang, Robert Lovrincic, Maksym V. Kovalenko, and Artem A. Bakulin "Hot-carrier cooling in lead-bromide perovskite materials", Proc. SPIE 11084, Physical Chemistry of Semiconductor Materials and Interfaces XVIII, 110840F (9 September 2019); https://doi.org/10.1117/12.2528131

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Nanocrystals

Perovskite

Solar cells

Phonons

Photovoltaics

Solar energy

Thermography

Show All Keywords

Keywords/Phrases

Search In:

Publication Years